Mibro 155120 Spiral Flute Screw Extractor Set User Manual

Introduction

The Mibro 155120 Spiral Flute Screw Extractor Set is designed for removing broken or stripped screws, bolts, and studs. This 5-piece set provides a reliable solution for fasteners that cannot be removed with standard tools. Each extractor features a left-hand spiral flute design to grip and extract the damaged fastener when turned counter-clockwise.

Image: The complete Mibro 155120 screw extractor set, showing all five extractors neatly organized within their transparent blue storage case.

Safety Information

• Always wear appropriate personal protective equipment, including safety glasses, to protect against flying debris.
• Ensure the workpiece is securely clamped or held to prevent movement during extraction.
• Use the correct size extractor for the damaged fastener to prevent further damage or injury.
• Do not apply excessive force, which can break the extractor or damage the surrounding material.
• Keep hands and fingers clear of rotating tools.
• Store extractors in their case when not in use to prevent damage and loss.

Components

The Mibro 155120 set includes five spiral flute screw extractors of varying sizes, designed to handle a range of fastener diameters.

• Extractor #1
• Extractor #2
• Extractor #3
• Extractor #4
• Extractor #5

Each extractor is clearly marked for easy identification.

Setup

1. Prepare the Fastener: Ensure the broken or stripped fastener is accessible and clean. If the fastener is broken below the surface, a pilot hole must be drilled.
2. Drill a Pilot Hole (if necessary): Using a drill bit slightly smaller than the extractor, drill a straight hole into the center of the damaged fastener. The depth of the hole should be sufficient for the extractor to get a firm grip. For best results, use a drill guide to keep the hole centered and straight.
3. Select Extractor Size: Choose the extractor that fits snugly into the pilot hole. The extractor should be large enough to provide sufficient torque without breaking, but not so large that it cannot enter the hole.

Operating Instructions

1. Insert Extractor: Insert the selected spiral flute extractor into the pre-drilled pilot hole. Tap it gently with a hammer if needed to ensure it seats firmly.
2. Attach Turning Tool: Use an appropriate turning tool, such as a tap wrench or adjustable wrench, to grip the square end of the extractor.
3. Extract the Fastener: Slowly turn the extractor counter-clockwise. As you turn, the left-hand spiral flutes will bite into the metal of the damaged fastener. Apply steady, even pressure while turning.
4. Continue Turning: Continue turning counter-clockwise until the damaged fastener loosens and can be removed. If resistance is high, apply penetrating oil and allow it to soak before attempting again.

Image: A detailed view of a single Mibro spiral flute screw extractor, highlighting its tapered, left-hand spiral design for effective grip.

Image: A side profile of a Mibro screw extractor, illustrating the square drive end designed for use with a wrench or tap handle.

Maintenance

• After each use, clean the extractors to remove any metal shavings or debris.
• Apply a light coat of rust-preventative oil if storing in a humid environment.
• Store the extractors in their original case to protect them from damage and keep them organized.
• Inspect extractors for wear or damage before each use. Do not use damaged extractors.

Troubleshooting

• Extractor slips:
  • Ensure the pilot hole is drilled to the correct size and depth.
  • Verify the extractor is fully seated and gripping the fastener.
  • Try a slightly larger extractor if the hole allows, or re-drill the pilot hole if possible.
• Fastener does not turn:
  • Apply penetrating oil to the fastener and allow it to soak for several minutes.
  • Gently tap the extractor with a hammer to help break the bond of the fastener.
  • Ensure you are turning the extractor counter-clockwise.
• Extractor breaks:
  • This usually indicates excessive force or an improperly sized pilot hole.
  • Removing a broken extractor from a fastener can be challenging and may require specialized tools or professional assistance.

Specifications

Warranty and Support

This Mibro product comes with a Satisfaction Guaranteed warranty. For specific details regarding warranty claims or product support, please refer to the manufacturer's official documentation or contact Mibro customer service.

For returns or replacements, please consult the retailer's return policy. For purchases made through Amazon, a 30-day refund/replacement policy is typically available.